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BrainF example: missing output
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Authored by boris.ulasevich on Dec 15 2016, 12:33 PM.

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rL292216: BrainF example: fixing output buffering issue

Summary

On MacOS BrainF Hello World program output without newline does not appear on the screen.
Adding fflush(stdout) call fixes the issue.

boris.ulasevich retitled this revision from to BrainF example: missing output.

boris.ulasevich updated this object.

apilipenko edited edge metadata.

This revision is now accepted and ready to land.Jan 11 2017, 7:15 AM

This revision was automatically updated to reflect the committed changes.

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llvm/

trunk/

examples/

BrainF/

4 lines

Show First 20 Lines • Show All 160 Lines • ▼ Show 20 Lines	if (JIT) {
ExecutionEngine *ee = EngineBuilder(std::move(Mod)).create();		ExecutionEngine *ee = EngineBuilder(std::move(Mod)).create();
if (!ee) {		if (!ee) {
errs() << "Error: execution engine creation failed.\n";		errs() << "Error: execution engine creation failed.\n";
abort();		abort();
}		}
std::vector<GenericValue> args;		std::vector<GenericValue> args;
Function *brainf_func = M.getFunction("brainf");		Function *brainf_func = M.getFunction("brainf");
GenericValue gv = ee->runFunction(brainf_func, args);		GenericValue gv = ee->runFunction(brainf_func, args);
		// Genereated code calls putchar, and output is not guaranteed without fflush.
		// The better place for fflush(stdout) call would be the generated code, but it
		// is unmanageable because stdout linkage name depends on stdlib implementation.
		fflush(stdout);
} else {		} else {
WriteBitcodeToFile(Mod.get(), *out);		WriteBitcodeToFile(Mod.get(), *out);
}		}

//Clean up		//Clean up
if (out != &outs())		if (out != &outs())
delete out;		delete out;

llvm_shutdown();		llvm_shutdown();

return 0;		return 0;
}		}